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. 2008 May 27;98(11):1781–1783. doi: 10.1038/sj.bjc.6604392

Table 1. Demographic characteristics of ovarian cancer cases and population-based controls.

  Cases (n=487) Controls (n=2653)
Demographic characteristics N (%) N (%)
Mean age (s.d.), years 55 (11.6) 54 (10.1)
High school degree 196 (42.8) 1070 (42.8)
Overweight or obese 272 (55.9) 1374 (51.8)
Oral contraceptive use 220 (45.5) 1411 (53.7)
Mean age (s.d.) at first birth, years 23.9 (4.5) 23.8 (4.5)
Nulliparous 105 (21.6) 311 (11.7)
Postmenopausal 309 (63.4) 1425 (53.7)
Ever smoker 253 (52.0) 1402 (52.8)
Tubal ligation 87 (17.9) 653 (24.6)
Hysterectomy 107 (22.0) 380 (14.3)
Family history of ovarian cancer 24 (4.9) 70 (2.6)